Machine-tool work supporting and driving mechanism



- 1,631,458. June 1927' A. G. BELDEN MACHINE TOOL WORK SUPPORTING AND DRIVING IEOHANIS Filed Feb. 19. 1924 2 Sheets-Sheet 1 I M b.ofl AlberT e. Biel den June; 7, 1,631,458

A.. 'G. BEL DEN MACHINE TOOL WORK suPPoRTnq G AND DRIVING mzcmm su Filed Feb. 19. 1924 2 Sheets-Swot 2 a I .60 U/wvew'hw mm A/berT G. Belde 'justably positioned thereon. 'The base may; befprovided with a suitable mechanismtoj' N T'EDQ TA T55 "P TE 15 ALBERT G. QBELIDENQOIF ona msmssrmem Assreuon l'ro adaman on? I ;,:eA1\TY or wononsmnn, vri ssAcHns T'rsnconroaA'rronior 'MAss oH 'snTT's. 1

V AcirrNn-"roor, wonkvsnrron'rrne 41in; narvfme EcrrANIsrr. v V

' My invention relates to machinetools and contained, motor driven type; d

' The headstock usually employed'onia'ma 5 chine tool of the type of a grinding machine has been driven from an'overhead counter; shaft, or by universallyconnectedshafting in the base of the machine or by-La motor mounted on theheadstock itself; This in waste of time 'andaconsequent loss of eifi ()l6IlCy." V p The mam-Ob ects of my inv'entionares to provlde an lmproved grinding machmeiheade andassembled,'which is serviceable for rapid production and which enables the'operatorfjto" stop the work rotation "without delay when the power is disconnected from 'thef work driving plate.' i-

' -"'In the' drawings in which like"r.efe'rence numerals indicate'hke' parts: F lg. 1 is a 1 fragmentary front elevation of F'g. 2 i'sa' sectional viewer-my headstock takenaapproximately onthe line 22 of Fig 3; a I i v f Fig. 3 is a fragmentaryfsection taken ,app'r'oz'nmately on' the'line 3-3'of Fig. 2

- ;In accordance'with one embodiment army invention I providea grinding'machine hav in'g aibasell, upon which isjslidably r'nounteda work table 12, with a-headstook 13, ad}

reciprocate og traverse' "th e workfl tablef relative' to thegrmdin wheel '14:; For thefsake a 'handtraverise mechanism, such as illus- 'trated in the patent'to'" Norton etalrNo. 1

'299,76i5.f0f April 8,;19 19 whichis suitablyconnectedto a rack (not shown) underneath I I v 56 the work 'table to'movPthe same.

vention relates particularly to'the motor particularly in machines adapted for'g'rindstock construction which is simple in f and easily "and economically "manufactured a grlndin fmac'hineil avingfla headstock of simplicity 'ofillustratiom I. have shown a -iApplication' filed'February 19;,1924.f Serial No.'6 93,89b

p In'rnyupreferred construction, the heade' more particularly to a headstock of the self stock comprises a base '18; Whichfis adapted, I tofit 'on the work table and support the other headstock; While theheadst'ock' be of either the dead center or thelivelcenter type, I have shown it'as having a'dead'ce'nten1'9 mounted in thei'fiired spindle 20,. which is suitably mounted in. theopening 21 of the base" 1 8. "A second shaft 22, is mounted in suitable bearings and] 24. parallel" With v andab'ove the spindle. On theend of this shaft22; I mount a gear'25 whichin turn meshes with a gear 26,rotatably mounted'on the *fixedspindle 20.; Surrounding the cen ter 19 isfa work drivingiplate" 29;;whi chiis" fixed to the gear 26. In headstocks where a live center is emplo'yed', the gear 26 and drive rotate the same. v v. i V The shaft 22 may be: suitablydriven as by a pulley 31 .rotatably mounted on the shaft 22 and adapted. to be connected thereto 'by means or, a clutch mechanism. The pulley maybedriven by af single or variable speedelectric mot0r32 mounted on the upper surfaceof the base -18 and connected with a source of electrical'en'ergyithrough,desired .c'ontrolhdeviceg but it" is' to be understoodthat the shaft Q Qfmay be driven through its" clutch from any desired source {of power. The armature"shaft.of the motor is provided with a: 'pu'ne 'ai, which is connected y t- 5 link, type ,V-belt33 with the" pulley-131; "each being provided with V-s'haped driving": groove" for this purpose. This (particular 7 type (if-belt is desir'ableas it bears ,uponthe beveled {faces of the groove of each pulley and not upon the bottom of'the groove; 1 The belt wedges into the-groove'and is'prevented 9 fromslirin and conse uentl. increases tl'ie driving efficiency of the headstock.-

' "To stopand start the work 'readilyjwithg V out. stopping the motor I projvideja suitable clutch me'c'hanisinto connect pulley 31 with the shaft 22, when includes a ifric-ti'o'ni disli arranged to-act as brakeand' stop the r01 mum of the work 'jth' .instaht the" clutch-is thrownfi This clutchimay' be'ofany'suitable} type but asri illustrated 7 comprises a member 38 having an internal}cone-shaped. aperture The member 138-is iprovided'ywith'ian emu, 7

e llv extending-hub l0, which surroundsthe' hub l'lO-ff i ed 89; whiclr'serves' as V a bearing on shaft 22.? The pulley'f-3l has an nt i 22 and slidably keyed thereto by a key 44 is 39 and is keyed thereto by akey 41. These parts are heldiir-place between the anember 38 and the central web of the pulley 31 by means of a nut 42 and collar 43, which are' screw-threaded onto "the shaft 22 and the hub 39- respect'ively. Surrounding the shaft brake. Iprovide the shaft 22 withia collar 47., fi=xedthereto by ataper pin 48, which takes up the end ,thrustof the shaft. Inter-- posed between .theclutch member and .the collar 47 and surronndingthe shaft 22 is a spring 50. which tends to urgdthe member 45 into engagement with :the member 38. r.

-To disconnect the clutch and .by :rthe same operation to stop :the rotation of the work, I

I employa yokedmember .51. which-strad dies the grooved portion 52 between the clutch member 45 and the flange 46. This yoke is provided with pins 53, which sup.- port .the loose fitting annular ring 54. This annular ring is adapted to zbe moved against the friction diskby theyyolie 51 to disconnect the clutch and also cause a friction to brake the rotation of the shaft- 2-2. Interposed be tween the member 54 ,and flane'e 46 is a trio tion disk.55 adapted to beheld in frictional engagement with the flange, when the yoked member is moved todisconnect the clutch.

The pressure of spring 50. transmitted to this frictionalndevice quickly brings the work to a standstill, -dueto .the friction be tween the rotating flange and the stationary parts of .the yoke device which are mounted on the base .of-the headstockI V For .convenienceinoperating, Ipro-vide a suitable hand lever .60 pivotallymounted on the front ofv theheadstock where iit is easily accessible'fto the operator; In machines hav ing along work table, this ,handlever may be arranged differently so that-it may be operated from any point along the table. The lever has a .cam shaped portion v6] which engages the undersurface of a lever 62. The latteris mountedon the frontend .of a rock shaft 68, which is'ca rried insuitable bearings 164and inthe frame 18. 'On the other end of the shaft 63 is mounted the yoked member 51. The, lever .60 is mounted upon a bracket 66 which also carries a notchedjplate -6 'l',having two notches there:- inL As shown in Fig. 1 the lever 60 is provided'with aspring pressed latch, which engages the notches in the plate Gi aud holds the lever 60 in 1 either the-stopping or start ing position. I ,f s I j The operation of this -mechanism. is ap parent from the foregoing disclosure. gThe drawings illustrate the clutch members in engagement and connecting the pulley 31 1 without stopping the electric motor, the op .eratorfreleas'es the latch pin on the "lever 60 and pushes "the lever downwardly against the pressure Qfthespring. 5.0. This action rocks the shaft 63 through the arm 62 and swings the yokedoiinember 51 toward the friction disk and disconnects the cone faces of the clutch. The .tensionofthe spring 150 tends to mo we the flanged anember 46 toward the yoke member and thus causes friction betweenthedisk55 andthe flange-46. These parts, there-fore, act as a brake and :stop the rotation o'f-thesshaft 22and the work-driw in plate geared thereto. immediately after theclutch is disengaged.

.Having thus described :my invention what I claim as new and desire to secure by Letters Patentis:

l. A machine tool headstock comprising a base, .a, work supporting spindle mounted thereoma work driveplate mountedon the spindle, a shaft parallel with .and gearedto said drive :plate, .a.-dr-ive pulleyrotatably mounted on said shaft, a sou-roe. of power,

driving connections between said source of powerand shaft and a clutch to connect said pulley and shaft. r a

"2. A machine tooliheadstock, comprising .abase, a work supporting spindle mounted thereon, a work drive plate mounted on -=sa1d spindle, a shaft mounted on the base parallel with said spindle, gearingoperated by the shaft to rotate .the drive plate, .a-motor mounted on said headstock-and clutchdriving mechanism to-con'nect and disconnect said motor and shaft-to -con-trol the rotation of the work; r V

3. A machine tool headstock'comprising a base,- a worksupporting and rotating mechanismmounted thereon, a driven shaft rotatably. mounted on the base, drivmgr-connections between the shaft and mechanism, means including a clutchtoconnect the shaft with a source of power to rotate the work and a frictional device to stop the rotation of the work after the clutch has been disconnected. I

.4. A. machine tooli h'eadstoc-k comprising work supporting .anddriving mechanism, a driven member, a clutchto connect the member with saidanechanism and rotate the work, friction d-isk connected to rotate with the work and :a friction memberv arranged to be thrown into contactwith said disk by movement of the clut'chto disconnect the, power from the.-'work,.so ias -to ,pos.itive.ly..stop the rotation of the work.

' 5.. A headstock for. a machine tool comprising a base. an electric motor mounted thereon, ,a work. supportingspindle on the basa .a shaft mounted in parallel with said spindle, a pulley rotatably mounted on .the

the Work,

shaft and driven by said motor, a friction clutch to connect the pull'ey'and the shaft, and a friction device cooperating with saidclutch to stop the rotation of the Work as soon as the" clutch has been disengaged,

6. A headstock for a machine tool com-k prising'a \vorksupport, a shaft monntedon the headstock which is connected to drive a driven 'rnembe'r "rotatably mounted on, said shaft, a friction drive clutch having one part connected to said member and another slidably keyed to the member mounted on the base andv movable shaft, a friction plate rotatable with the shaft, and means -to disconnect the clutch and stop the Work rotation including a into engagement-with the friction plate to retard the rotation of the shaft when the clutch parts are disconnected. j

prising a Workdriv ing member, a shaft mounted on the headstock and connected to rotate said member, a positively driven pul 7 ably connected with the shaft. a friction :and having a portion arranged to engage the friction-plate when the clutch members clutch membersrin engagen'ient and manu ally operable means to move the yoke against the tension of the spring;

Signed: at Worcester, Massachusetts, this I 18thjday of February, 1 924.

'ley rotatably mounted on the shaft, a fric- L tion clutch having *one member rotatable 25 with the pulley and a second mernberslidplate fixed to said second clutch "memk are disengaged, a spring tending to hold the r ALBERT GQBELDENQ" 

